I have the same experience. Toronto id a dry place and its worsened by the AC in the summer and heaters in the winter. I use Areo black or Chaopai red. From my various experiments I find the best way to steam a shuttle is to do it the day before. After steaming I would put a moist paper towel on both ends of the tube and leave it for the night. The paper towel absorbs the condensed steam and keeps the tubes internal humidity high. Otherwise the steam cools and the water just flows from the tube. The overnight hold allows the feathers to saturate but not too much where the adhesive is affected.